Are there any portable aquarium heaters suitable for travel?

Compact 10W fully submersible mini heater with shatterproof housing and thermal safety shut-off, designed for aquariums 2.5-5 gallons. Suits desktop tanks and small setups needing low-wattage, fixed-temperature heating.

A 150W Cascade submersible preset heater for aquariums up to about 30 gallons. It is a glass-bodied heater with visible preset temperature scale, on/off light, and suction-cup mounting, suited for hobby freshwater or saltwater tanks needing a simple preset heater.

A very small 10W USB-powered submersible heater intended for very small tanks (around 0.5-1 gallon). It's compact and USB-powered, suitable for nano tanks and planted jars that need mild warming.

Digital electronic heater with dual sensors and safety features; designed for aquariums up to ~100 US gal and suits hobbyists needing precise, submersible temperature control.

Compact flat heater for 1-20 gallon tanks with a shatterproof quartz heating tube, digital display, external controller, and multiple safety shutoffs. Suited for betta tanks, turtle tanks, shrimp tanks, and other small freshwater or saltwater setups.

Compact USB-powered 10W submersible heater for very small tanks (0.5-1 gallon) with an external controller and LED display. Maintains temperature precisely and includes overheating protection; suited for nano tanks, shrimp tanks, and small bettas.

Thumb-sized submersible heater for nano and small tanks (1-26 gallons) available in 10W-100W. Features a 15-34°C range, 2 mm quartz glass construction, LED display, memory and safety protections, and an external controller for setting temperature.

Tiny submersible heater with an external LED controller, explosion-resistant quartz glass construction, and auto shut-off/dry-run protection. Suited for nano tanks, betta tanks, shrimp tanks, and desktop single-gallon setups.

Compact USB-powered 10W heater for 0.5-1 gallon tanks with an external temperature controller and LED display. Offers adjustable temperature, memory of settings, and overheating protection; suited for very small aquariums or betta tanks.

Glass aquarium heater with a fully electronic thermostat, ceramic heat sink, One Touch temperature setting and LED temperature display. Accurate to ±0.4°C and suitable for freshwater and marine tanks; good for sensitive species and treating temperature-based illnesses.

Compact 10 W fully submersible heater designed for very small tanks (up to ~3.5 gallons). It uses a preset thermostat to maintain a narrow temperature band and includes suction cups for mounting, suited for betta or turtle bowls and very small aquaria.

Compact 10W USB-powered heater for very small tanks (0.5-1 gallon) with an external LED controller, adjustable temperature from 18°C to 34°C, and built-in overheating protection. Suited for nano aquariums, betta tanks, and small enclosures where space is limited.

Compact, flat aquarium heater with shatterproof quartz tube, external knob controller, LCD temperature display, and safety auto shut-off. Suited for very small freshwater or saltwater tanks (1-20 gal), betta tanks, turtle tanks, shrimp tanks, and desk aquariums.

Thumb-sized submersible heater available in four power options for 1-26 gallon tanks. Features a quartz glass heating tube, external temperature controller, LED display, and safety protections, suited for nano tanks, bettas, shrimp, and small marine or freshwater setups.

Compact 50 W submersible heater with a built-in electronic thermostat designed to maintain aquarium water at about 78°F (25.5°C). Suited for small tanks (2-10 gallons) where a simple, set-and-forget heater is acceptable.